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Segment Reporting (Summary of Segment Performance) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Revenue $ 777,707 $ 626,336
Income from operations 247,622 144,325
Interest expense, net (7,532) (7,552)
Income before provision for income taxes 240,090 136,773
Provision for income taxes 35,801 24,917
Net income 204,289 111,856
Less: Net income attributable to noncontrolling interest 32 29
Net income attributable to IDEXX Laboratories, Inc. stockholders 204,257 111,827
CAG    
Segment Reporting Information [Line Items]    
Revenue 692,767 551,996
Income from operations 213,210 118,659
Water    
Segment Reporting Information [Line Items]    
Revenue 34,040 34,149
Income from operations 14,772 15,882
LPD    
Segment Reporting Information [Line Items]    
Revenue 39,270 34,154
Income from operations 13,808 9,663
Other    
Segment Reporting Information [Line Items]    
Revenue 11,630 6,037
Income from operations $ 5,832 $ 121